Question

笼子里有若干只鸡和兔从上面数,有8个头,从下面数,有22只脚.(方程解)

Answer 1

设鸡x只,则：兔（8-x）只.

2x+4（8-x）=22

2x+32-4x=22

2x=32-22

2x=10

x=5

8-x=3

答：鸡5只,兔子3只.